package cn.nio.test;

public class Main4 {
    protected  int i;
    protected Main4(){
        super();
    }
    protected void f1(){
        System.out.println("f1");
    }
}
class M{
    public static void main(String[] args) {
        Main4 main4=new Main4();
        main4.f1();
    }
}
